Thursday, August 10, 2017

My tshark cheat-sheet

Supratim Sanyal's Blog: Wireshark

Ever-evolving list of tshark command lines I use for various purposes, with a goal of avoiding trolling through wireshark and tcpdump man pages every time to find the filters. Generally adding a -V, -VV or -VVV switch increases verbosity levels. I also usually prepend the tshark command with nice -n 19 ionice -c3 to try to minimize processor (CPU) and disk I/O usage when running tshark.

  • Monitor DECnet-UDP bridged traffic to HECnet. The following is for the VPS hosting CLOUDY:: and JUICHI:: which bridges DECnet over UDP to HECnet update host and QCOCAL:: hosted on (described in my post here):
    # tshark -i ens33 -f "host" -f "host" -f "udp port 4711" -f "udp port 4712"
  • Capture all NTP traffic:
    # tshark -i ens33 -f "udp port 123"
  • Capture all NTP server traffic. This mostly logs NTP time served by this server to other hosts.
    # tshark -i ens33 -f "udp port 123" | grep "server"
  • To capture all NTP traffic for this host serving time to other hosts, grep like follows:
    # tshark -i ens33 -f "udp port 123" | egrep " ->" | grep server
  • Capture all NTP client traffic. This mostly logs NTP traffic that synchronizes this host from remote clock source hosts.
    # tshark -i ens33 -f "udp port 123" | grep "client"
  • Capture all traffic to SanyalCraft Minecraft server (on port 25565) and our experimental Minecraft server on port 25566:
    # tshark -i ens33 -f "tcp port 25565" -f "tcp port 25566" 

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